How to find cos2θif sinθ= 2?

How to find cosθif sin2θ= 3?

Both lie in quadrant I. I'm unsure how to convert from one identity to the other ...

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- Nov 28th 2012, 06:56 PMwhittwhittCos2θ to sinθ? Identity conversions
How to find cos2

**θ**if sin**θ**= 2?

How to find cos**θ**if sin2**θ**= 3?

Both lie in quadrant I. I'm unsure how to convert from one identity to the other ... - Nov 28th 2012, 07:03 PMjakncokeRe: Cos2θ to sinθ? Identity conversions
How can $\displaystyle sin(\theta) = 2 $ if its maximum value is 1.

- Nov 29th 2012, 03:15 AMskeeterRe: Cos2θ to sinθ? Identity conversions
In this post ...

http://mathhelpforum.com/trigonometr...equations.html

...you were requested to post specific problems rather than cryptic references to double angle problems. Now it seems you're making up stuff, because you really don't know what you're doing.

.__Post a specific problem from a text or as given by your instructor__ - Nov 29th 2012, 05:42 AMtopsquarkRe: Cos2θ to sinθ? Identity conversions
Yes. Impossible. $\displaystyle -1 \leq sin(\theta) \leq 1$. For any angle in any quadrant.

You have now got several references to the double angle formulas. Please use them and show us what you've got.

But please let us know what the actual problem statements are. You have been asked to clarify a question before.

-Dan